Overview. Caffeine is a chemical primarily found in coffee and tea, but which also appears in various sodas, sports drinks and foods. It is a stimulant, therefore causing changes in metabolism as well as increases in focus and energy. Caffeine is addictive and can cause withdrawal following cessation after frequent use.
robot. 1  a machine that resembles a human and does mechanical, routine tasks on command. 2  a person who acts and responds in a mechanical, routine manner, usually subject to another's will; automaton. 3  any machine or mechanical device that operates automatically with humanlike skill.
(plural automatons or automata) A machine or robot designed to follow a precise sequence of instructions. A person who acts like a machine or robot, often defined as having a monotonous lifestyle and lacking in emotion. Due to her strict adherence to her daily schedule, Jessica was becoming more and more convinced that she was an automaton. A departure from principle in one instance becomes a precedent for a second, that second for a third, and so on 'til the bulk of the society is reduced to be mere automatons of misery, to have no sensibilities left but for sinning and suffering.